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Venting and Combustion Air Installation
Venting Option - Direct Vent / Horizontal
In this vent application the PERFORMANCE
PLUS is vented horizontally through a wall
using only approved 3-inch stainless steel vent
material and using outside air for combustion.
The installer should consider the following
when choosing this vent option:
a. The vent system should contain a con-
densate trap located near the unit as
shown in Figs. 22, 22A & 22B, page 34.
b. The vent system must pitch back to the
unit 1/4 inch per foot.
Although the vent system is allowed to
pitch away from the unit, it is recom-
mended that the vent system pitches
toward the unit with a condensate drain
installed as close to the unit as possible.
Opting to pitch the vent system away
poses potential damage to the building
exterior or to the surrounding landscape
and/or potential risks of icing if conden-
sate is formed.
c. Penetration at the wall requires a thimble.
d. Clearance to combustibles must be
maintained per the vent manufacturer’s
requirements. Refer to the vent manu-
facturer’s installation instructions for
additional details.
Maintain a minimum 2-inch clearance to
combustible wall and 1-inch clearance to
non-combustible in the absence of a
manufacturer’s recommended clearance
when penetrating a sidewall.
e. For a zero clearance concentric termina-
tion of the vent and combustion air refer
to the Horizontal Concentric, Horizontal
Single Wall Vent or Horizontal Wa l l
Thimble Kits.
There are two methods available for Direct
Venting - Horizontal:
Separate: The vent and the combustion air
inlet are run together and exit the structure sep-
arately with different terminations. See Fig. 23,
page 35.
The combustion air inlet and the vent
termination must reside in the same
pressure zone area of the building for
proper operation of the appliance.
Combination: The vent and combustion air ter-
minate at a single concentric point using the
Horizontal Concentric, Horizontal Single Wa l l
Vent or Horizontal Wall Thimble Kit. See Figs.
22, 22A & 22B page 34.
Horizontal Wall Thimble Kit
- Requires a 5 1/2 inch x 5 1/2 inch penetra-
tion through any type of wall.
- Allows zero clearance at the wall penetration.
- Maximum wall thickness is 11 inches.
- The use of a termination elbow for the
venting system is not recommended when
using the Horizontal Wall Thimble Kit.
To prevent potential nuisance lock-outs
or flue gas recirculation it is recom-
mended to terminate the vent with a hor-
izontal termination tee or side discharge
vent hood.
BEST PRACTICES
NOTICE
NOTICE
BEST PRACTICE